Enhancement of the crosslink density, glass transition temperature, and strength of epoxy resin by using functionalized graphene oxide co-curing agents

Yu, Jin Won; Jung, Jin Kyo; Choi, Yong-Mun; Choi, Jae Hun; Yu, Jaesang; Lee, Jae Kwan; You, Nam‐Ho; Goh, Munju

doi:10.1039/c5py01483b

Cited by 110 publications

(56 citation statements)

References 37 publications

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“…It has been reported that the heat resistance property of polymers increases by loading nanoadditive due to the restricted segmental motions at the organic–inorganic interface neighborhood of polymer composites . The restriction effect induces rise in the modules and thus improves the heat resistance property of polymer composite.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of polyamide 6/exfoliated graphite nanoplate composites via ultrasound‐assisted processing

Yang

Zhao

Xia

et al. 2017

Polymer Engineering & Sci

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In this work, we report a facile strategy to prepare polyamide 6/exfoliated graphite nanoplate (PA6/xGNP) nanocomposites by in situ exfoliation of expanded graphite (EG) via ultrasound‐assisted extrusion. The EG was preliminarily exfoliated by ultrasonication, and then blended with PA6 and further exfoliated into graphite nanoplates during the ultrasound‐assisted extrusion process. Compared with chemical exfoliation of EG, ultrasonic exfoliation minimized defects in the carbon layers. Meanwhile, the in situ exfoliation of EG via ultrasound‐assisted extrusion prevented the reagglomeration of xGNPs in the melt blending process. The well‐dispersed xGNP structure significantly improved the mechanical performance of PA6 composites; with an xGNP loading of only 0.5 wt%, the tensile and flexural strengths of the PA6 nanocomposite increased from 65.4 and 67.8 MPa to 90.5 and 91.2 MPa, respectively. The heat deflection temperature also greatly improved from 76.5°C to 115.4°C by adding 1 wt% xGNPs. These results demonstrate a promising approach for large‐scale fabrication of high‐performance polymer/xGNP nanocomposites. POLYM. ENG. SCI., 58:1739–1745, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Facile preparation of polyamide 6/exfoliated graphite nanoplate composites via ultrasound‐assisted processing

Yang

Zhao

Xia

et al. 2017

Polymer Engineering & Sci

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“…For the DMA measurements, samples with a thickness of 0.7 mm and a width of 6.0 mm were prepared by polishing EP nanocomposites with fine sandpaper. The CD of EP nanocomposites was calculated using the following formula:

ρ = G^{'} / R T

where G´ is the shear modulus calculated from the storage and loss moduli measured in the rubbery region of the EP nanocomposites using DMA, R is a universal gas constant (8.314472 J/K mol), T is the absolute temperature at which G´ was determined, and ρ is the CD (mol/cm 3 ).…”

Section: Methodsmentioning

confidence: 99%

“…The crosslink density (CD) is generally recognized as a critical factor influencing the interfacial strength between EP and nanofiller materials . A high CD value indicates a high density of covalent bonding.…”

Section: Introductionmentioning

confidence: 99%

“…Such bonds allow a higher thermal conductivity than van der Waals interactions because bond stretching occurs in the same direction for covalent bonds but perpendicular to each other for van der Waals interactions, resulting in a decrease of phonon scattering and a high l by opening new heat transfer channels . Recently, to increase the CD of EP nanocomposites, a method to add diamine‐functionalized graphene oxides to EP as co‐curing agents was reported . By using co‐curing agents, covalent bonds could form between the graphene oxide and EP, resulting in an increased CD of the EP nanocomposites from 0.028 to 0.069 mol/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of crosslink density on thermal conductivity of epoxy/carbon nanotube nanocomposites

Choi

Song

Jung

et al. 2016

J of Applied Polymer Sci

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The effect of the polymeric crosslink density on the thermal conductivity of an epoxy nanocomposite was investigated by adding two different diamine‐functionalized multiwalled carbon nanotubes (diamine‐MWNTs) to the epoxy resin as co‐curing agents and conducting fillers. Tetramethylenediamine (TMDA)‐MWNTs resulted in an epoxy nanocomposite with a higher crosslink density than octamethylenediamine (OMDA)‐MWNTs. Interestingly, epoxy/TMDA‐MWNT nanocomposites under 1.5 wt % nanotube concentration, showed a higher thermal conductivity than an epoxy/OMDA‐MWNT nanocomposite with the same concentration of nanotubes. In contrast, for higher diamine‐MWNT concentrations (over 2.0 wt %), the thermal conductivity of the epoxy/OMDA‐MWNT nanocomposite was higher than that with TMDA‐MWNTs. We observed that for low MWNT concentrations, where a percolating network was not formed, a high crosslink density enhanced the thermal conductivity via phonon transport. However, for high MWNT concentrations, a high crosslink density hinders the formation of a percolating network and lowers the thermal conductivity. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44253.

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“…Due to cross-linking reaction, change in mechanical parameters with respect to temperature yields valuable information about the cure state [20][21][22][23]. Several researchers have reported the efficacy of DMTA for the detection of glass transition temperature and the cure state [24][25][26][27]. The variation of Tg because of the altered hold time at upper cure temperature (180 ºC) for Quickstep processing is shown in Fig.…”

Section: Dmta Analysismentioning

confidence: 99%

Aerospace composite cured by quickstep and autoclave processing techniques: Evaluation and comparison of reaction progress

Day

Khan

Kausar

2017

Aerospace Science and Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. curing path for 977-2A resin was different than the autoclave curing; however the final cross-linked structure was similar to that of autoclave cured samples. Aerospace Composite Cured by Quickstep and Autoclave Processing Techniques: Evaluation and Comparison of Reaction Progress

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Enhancement of the crosslink density, glass transition temperature, and strength of epoxy resin by using functionalized graphene oxide co-curing agents

Abstract: Epoxy nanocomposites are fabricated by using diamine-functionalized GO and exhibit high Tg, tensile strength, and crosslink density.

Cited by 110 publications

References 37 publications

Facile preparation of polyamide 6/exfoliated graphite nanoplate composites via ultrasound‐assisted processing

Facile preparation of polyamide 6/exfoliated graphite nanoplate composites via ultrasound‐assisted processing

Effect of crosslink density on thermal conductivity of epoxy/carbon nanotube nanocomposites

Aerospace composite cured by quickstep and autoclave processing techniques: Evaluation and comparison of reaction progress

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